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A custodial symmetry for Zbb

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arxiv hep-ph/0605341 v2 pith:BWKAPFZ5 submitted 2006-05-31 hep-ph

Kaustubh Agashe , Roberto Contino , Leandro Da Rold , Alex Pomarol This is my paper
classification hep-ph
keywords symmetrycorrectionscustodialhiggsmodelsprotectprotectsallows
verification ladder T0 review T1 audit T2 compute T3 formal
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We show that a subgroup of the custodial symmetry O(3) that protects delta rho from radiative corrections can also protect the Zbb coupling. This allows one to build models of electroweak symmetry breaking, such as Higgsless, Little Higgs or 5D composite Higgs models, that are safe from corrections to Z-> bb. We show that when this symmetry protects Zbb it cannot simultaneously protect Ztt and Wtb. Therefore one can expect to measure sizable deviations from the SM predictions of these couplings at future collider experiments. We also show under what circumstances Zb_R b_R can receive corrections in the right direction to explain the anomaly in the LEP/SLD forward-backward asymmetry A^b_{FB}.

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Cited by 4 Pith papers

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  4. The Sensitivity of Higgs Factories to Composite Higgs Models via Precision Measurements

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